ASTM B21/B21M-20

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it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: B21/B21M − 18 (Reapproved 2019) B21/B21M − 20
Standard Specification for
Naval Brass Rod, Bar, and Shapes
This standard is issued under the fixed designation B21/B21M; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This specification establishes the requirements for naval brass rod, bar, and shapes produced from Copper Alloy UNS Nos.
C46200, C46400, C46750, C47940, C48200, C48500, C48640, or C48640.C48645.
1.1.1 For piston-finish rod or shafting refer to the Other Requirements Section.
1.1.2 For hot forging material, refer to Specification B124/B124M.
1.2 Units—The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text,
SI units are shown in brackets. The values stated in each system are not necessarily exact equivalents; therefore, to ensure
conformance with the standard, each system shall be used independently of the other and values from the two systems shall not
be combined.
1.3 Warning—Mercury is a definite health hazard in use and disposal (see Performance Requirements).
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
B124/B124M Specification for Copper and Copper Alloy Forging Rod, Bar, and Shapes
B154 Test Method for Mercurous Nitrate Test for Copper Alloys
B249/B249M Specification for General Requirements for Wrought Copper and Copper-Alloy Rod, Bar, Shapes and Forgings
B601 Classification for Temper Designations for Copper and Copper Alloys—Wrought and Cast
B858 Test Method for Ammonia Vapor Test for Determining Susceptibility to Stress Corrosion Cracking in Copper Alloys
E8/E8M Test Methods for Tension Testing of Metallic Materials
E18 Test Methods for Rockwell Hardness of Metallic Materials
E62 Test Methods for Chemical Analysis of Copper and Copper Alloys (Photometric Methods) (Withdrawn 2010)
E478 Test Methods for Chemical Analysis of Copper Alloys
3. General Requirements
3.1 The following sections of Specification B249/B249M constitute a part of this specification:
3.1.1 Terminology;
3.1.2 Materials and Manufacture;
3.1.3 Workmanship, Finish, and Appearance;
3.1.4 Sampling;
This specification is under the jurisdiction of ASTM Committee B05 on Copper and Copper Alloys and is the direct responsibility of Subcommittee B05.02 on Rod, Bar,
Wire, Shapes and Forgings.
Current edition approved April 1, 2019April 1, 2020. Published April 2019April 2020. Originally approved in 1918. Last previous edition approved in 20182019 as
B21/B21M–18. –18 (2019). DOI: 10.1520/B0021_B0021M–18R19.10.1520/B0021_B0021M–20.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
The last approved version of this historical standard is referenced on www.astm.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B21/B21M − 20
3.1.5 Number of Tests and Retests;
3.1.6 Specimen Preparation;
3.1.7 Test Methods;
3.1.8 Significance of Numerical Limits;
3.1.9 Inspection;
3.1.10 Rejection and Rehearing;
3.1.11 Certification;
3.1.12 Mill Test Report;
3.1.13 Packaging and Product Marking; and
3.1.14 Supplementary Requirements.
3.2 In addition, when a section with a title identical to that referenced in 3.1, above, appears in this specification, it contains
additional requirements which supplement those appearing in Specification B249/B249M.
4. Ordering Information
4.1 Include the following specified choices when placing orders for product under this specification, as applicable:
4.1.1 ASTM designation and year of issue;
4.1.2 Copper Alloy UNS No. designation (Scope);
4.1.3 Temper (Temper Section and related Tables);
4.1.4 Form—cross-section such as round, hexagonal, square, and so forth;
4.1.5 Diameter or distance between parallel surfaces, width and thickness (Dimensions and Permissible Variations);
4.1.6 Length (Dimensions and Permissible Variations);
4.1.7 Edge contours (Dimensions and Permissible Variations);
4.1.8 Quantity—number of pieces or total weight, for each size and form; and
4.1.9 Intended application.
4.2 The following options are available, but may not be included, unless specified at the time of placing of the order when
required:
4.2.1 Tensile test for product ⁄2 in. [12 mm] and over, for the alloys and tempers listed in Table 4;
4.2.2 Residual stress test (Performance Requirements section);
4.2.3 Piston finish rod or shafting (Other Requirements section);
4.2.4 Certification (Specification B249/B249M);
4.2.5 Mill test report (Specification B249/B249M);
4.2.6 Heat identification or traceability details (Specification B249/B249M); and
4.2.7 If product is purchased for agencies of the U.S. Government (Other Requirements—Purchases for U.S. Government).
5. Chemical Composition
5.1 The material shall conform to the chemical composition requirements specified in Table 1 for the Copper Alloy UNS No.
designation specified in the ordering information.
5.2 These composition limits do not preclude the presence of other elements. Limits may be established and analysis required
for unnamed elements by agreement between the manufacturer or supplier and purchaser.
5.3 For alloys in which zinc is listed as the “remainder,” either copper or zinc may be taken as the difference between the sum
of the results of all other elements determined and 100 %. When copper is so determined, that difference value shall conform to
the requirements given in Table 1.
5.4 When all the elements listed in Table 1 for the Copper Alloy No. are determined, the sum of the results shall be 99.6 %
minimum except for C46750 C46750, C48640, and C48640,C48645, which shall be 99.5 % minimum.
TABLE 1 Chemical Requirements
Copper Alloy UNS No.
Element,
%
C46200 C46400 C46750 C47940 C48200 C48500 C48640 C48645
Copper 62.0–65.0 59.0–62.0 59.2–62.5 63.0–66.0 59.0–62.0 59.0–62.0 59.0–62.0 60.0–63.0
Tin 0.50–1.0 0.50–1.0 1.00–1.80 1.2–2.0 0.50–1.0 0.50–1.0 0.50–2.0 0.10–1.5
Lead 0.20 max 0.20 max 0.25 max 1.0–2.0 0.40–1.0 1.3–2.2 1.0–3.0 1.0–2.5
Zinc remainder remainder remainder remainder remainder remainder remainder remainder
Iron 0.10 max 0.10 max 0.10 max 0.10–1.0 0.10 max 0.10 max 0.40 max 0.30 max
A B B
Nickel . . 0.50 max 0.10–0.50 . . 0.30 max 0.10–1.0
Antimony . . 0.05–0.15 . . . . .
Phosphorus . . 0.05–0.15 . . . 0.05–0.25 0.02–0.25
A
Including cobalt.
B
Not including Co.
B21/B21M − 20
TABLE 2 Tensile Requirements, Inch-pound
Tensile Yield Strength at 0.5 % Elongation in 4 ×
Temper Designation Diameter or Distance
A
Strength, Extension Under Load, Diameter or Thickness
Between Parallel Surfaces,
B
Code Name
in.
min, ksi min, ksi of Specimen, min, %
Copper Alloy UNS No. C46200
M30 as-hot extruded all forms, all sizes 50 20 30
O60 soft anneal rods and bars, all sizes 48 16 30
O50 light anneal rods and bars:
0.500 and under 58 27 22
over 0.500 to 1.000, incl 56 27 25
over 1.000 to 2.000, incl 54 26 25
over 2.000 to 3.000, incl 52 25 27
over 3.000 to 4.000, incl 50 22 30
over 4.000 50 20 30
H60 cold heading, forming rods, all sizes 48 18 22
H02 half-hard rods and bars:
0.500 and under 58 27 22
over 0.500 to 1.000, incl 56 27 25
over 1.000 to 2.000, incl 54 26 25
over 2.000 to 3.000, incl 52 25 27
over 3.000 to 4.000, incl 50 22 30
over 4.000 50 20 30
H04 hard rods and bars:
0.500 and under 64 40 13
over 0.500 to 1.000, incl 62 38 13
over 1.000 to 2.000, incl 58 34 18
Copper Alloy UNS No. C46400
M30 as-hot extruded all forms, all sizes 52 20 30
O60 soft anneal rods and bars:
1.000 and under 54 20 30
over 1.000 to 2.000, incl 52 20 30
over 2.000 50 20 30
shapes, all sizes 52 20 30
O50 light anneal rods and bars:
0.500 and under 60 27 22
over 0.500 to 1.000, incl 60 27 25
over 1.000 to 2.000, incl 58 26 25
over 2.000 to 3.000, incl 54 25 25
over 3.000 to 4.000, incl 54 22 27
over 4.000 54 22 30
C C
H50 extruded and drawn shapes, all sizes 58 25 20
H02 half-hard rods and bars:
0.500 and under 60 27 22
over 0.500 to 1.000, incl 60 27 25
over 1.000 to 2.000, incl 58 26 25
over 2.000 to 3.000, incl 54 25 25
over 3.000 to 4.000, incl 54 22 27
over 4.000 54 22 30
H04 hard rods and bars:
1.000 and under 67 45 13
over 1.000 to 2.000, incl 62 37 18
Copper Alloy UNS No. C46750
M30 as hot extruded all forms, all sizes 48 20 15
O60 soft annealed rod and bar, all sizes 49 20 15
O61 annealed rod and bar, all sizes 49 20 15
H50 hot extruded and drawn rod and bar:
over 0.300 to .500 48 20 5
over 0.500 to 1.000 48 20 10
over 1.000 48 20 15
Copper Alloy UNS No. C47940
M30 as-hot extruded all forms, all sizes 50 20 30
O60 soft anneal rods and bars, all sizes 48 20 30
O50 light anneal rods and bars:
0.500 and under 58 30 18
over 0.500 to 1.000, incl 56 30 20
over 1.000 to 2.0, incl 54 25 22
over 2.000 50 25 25
C C
H50 extruded and drawn shapes, all sizes 56 25 20
H02 half-hard rods and bars:
0.500 and under 58 30 18
over 0.500 to 1.000, incl 56 30 20
over 1.000 to 2.000, incl 54 25 22
over 2.000 50 25 25
H04 hard rods and bars:
0.500 and under 70 55 10
over 0.500 to 1.000, incl 65 52 13
over 1.000 to 2.000, incl 62 45 15
B21/B21M − 20
TABLE 2 Continued
Diameter or Distance Tensile Yield Strength at 0.5 % Elongation in 4 ×
Temper Designation
A
Strength, Extension Under Load, Diameter or Thickness
Between Parallel Surfaces,
B
Code Name
in. min, ksi min, ksi of Specimen, min, %
Copper Alloy UNS No. C48200
M30 as-hot extruded all forms, all sizes 52 20 25
O60 soft anneal rods and bars:
1.000 and under 54 20 25
over 1.000 to 2.000, incl 52 20 25
over 2.000 50 20 25
shapes, all sizes 52 20 25
O50 light anneal rods and bars:
1.000 and under 60 27 18
over 1.000 to 2.000, incl 58 26 20
over 2.000 to 3.000, incl 54 25 20
over 3.000 to 4.000, incl 54 22 20
over 4.000 54 22 25
C C
H50 extruded and drawn shapes, all sizes 58 25 15
H02 half-hard rods and bars:
1.000 and under 60 27 18
over 1.000 to 2.000, incl 58 26 20
over 2.000 to 3.000, incl 54 25 20
over 3.000 to 4.000, incl 54 22 20
over 4.000 54 22 25
H04 hard rods and bars:
1.000 and under 67 45 11
over 1.000 to 2.000, incl 62 37 15
Copper Alloy UNS No. C48500
M30 as-hot extruded all forms, all sizes 52 20 20
O60 soft anneal rods and bars:
1.000 and under 54 20 20
over 1.000 to 2.000, incl 52 20 20
over 2.000 50 20 20
shapes, all sizes 52 20 20
O50 light anneal rods and bars:
1.000 and under 60 27 12
over 1.000 to 2.000, incl 58 26 20
over 2.000 to 3.000, incl 54 25 20
over 3.000 to 4.000, incl 54 22 20
over 4.000 54 22 20
C C
H50 extruded and drawn shapes, all sizes 58 25 15
H02 half-hard rods and bars:
1.000 and under 60 27 12
over 1.000 to 2.000, incl 58 26 20
over 2.000 to 3.000, incl 54 25 20
over 3.000 to 4.000, incl 54 22 20
over 4.000 54 22 20
H04 hard rods and bars:
1.000 and under 67 45 10
over 1.000 to 2.000, incl 62 37 13
Copper Alloy UNS No. C48640 and C48645
M30 as hot-extruded all forms, all sizes 45.7 18 15
H02 half-hard rod and bar:
0.300 to 0.500, incl 45.7 18 5
over 0.500 to 1.00, incl 45.7 18 10
over 1.000 45.7 18 15
A
For rectangular bar, the Distance Between Parallel Surfaces refers to thickness.
B
In any case, a minimum gage length of 1 in. shall be used.
C
This temper does not apply to hollow shapes.
6. Temper
6.1 The standard tempers for products described in this specification, as defined in Classification B601, are shown in Tables 2
and 3.
7. Mechanical Property Requirements
7.1 Product furnished under this specification shall conform to the mechanical property requirements prescribed in Tables 2-4.
7.1.1 Rockwell Hardness Requirements—For the alloys and tempers listed, the product ⁄2 in. [12 mm] an
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